Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery, relates to the technical field of battery accessories, and aims to optimize the structure of a battery cover plate to a certain extent, improve the pressure relief capability of the battery and ensure the use stability and safety of the battery. The utility model provides a cover plate assembly which comprises a cover plate, a plugging piece and a limiting piece. A pressure relief hole is formed in the cover plate, the limiting piece corresponds to the pressure relief hole and is connected with the cover plate, and a limiting space is formed by the limiting piece and the cover plate; the blocking piece is arranged in the limiting space and blocks the pressure relief hole, and the blocking piece can be pressed to deform so as to open the pressure relief hole.

Description

Technical Field

[0001] The utility model relates to the technical field of battery accessories, in particular to a cover plate assembly and a battery. Background Art

[0002] The explosion-proof valve can release pressure in time when the battery is in thermal runaway, thus avoiding battery explosion and potential safety hazards to a certain extent. However, in some usage scenarios, the pressure generated in the battery does not reach the lower limit of the explosion-proof valve opening, resulting in failure to release pressure. As the battery is used, it will swell until thermal runaway occurs, affecting the battery's service life.

[0003] Therefore, there is an urgent need to provide a cover plate assembly and a battery to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0004] The utility model aims to provide a cover plate assembly, so as to optimize the battery cover plate structure to a certain extent, improve the pressure relief capacity of the battery, and ensure the stability and safety of the battery in use.

[0005] The utility model provides a cover plate assembly, comprising a cover plate, a sealing member and a limiting member; a pressure relief hole is formed on the cover plate, the limiting member is arranged corresponding to the pressure relief hole, is connected to the cover plate, and forms a limiting space with the cover plate; the sealing member is arranged in the limiting space and blocks the pressure relief hole, and the sealing member can be deformed under pressure to open the pressure relief hole.

[0006] Wherein, the limiting member comprises a connecting portion and a covering portion, wherein the connecting portion is arranged around the circumference of the covering portion and forms the limiting member with the covering portion having a cross-shaped cross section in the vertical direction.

[0007] Specifically, a first positioning groove is formed on the cover plate at a position corresponding to the pressure relief hole, the diameter of the first positioning groove is matched with the outer diameter of the limiting member, and the connecting portion of the limiting member is embedded in the first positioning groove.

[0008] Specifically, the cover portion is formed with a hollow hole, and the hollow hole penetrates along the thickness direction of the cover portion, so that the limiting space is connected with the outside.

[0009] Furthermore, there are a plurality of hollow holes, and the plurality of hollow holes are evenly distributed along the circumference of the limiting member.

[0010] Wherein, the material of the blocking member is elastic and resistant to electrolyte corrosion.

[0011] Specifically, a second positioning groove is formed on the cover plate at a position corresponding to the pressure relief hole, and the diameter of the second positioning groove is smaller than the diameter of the first positioning groove. A protrusion is formed on the sealing member, and the diameter of the protrusion matches the diameter of the second positioning groove and is embedded in the second positioning groove.

[0012] Furthermore, a recess is formed on the end surface of the blocking member away from the pressure relief hole, the recess is located at the center of the blocking member, and the edge of the end of the blocking member abuts against the inner wall of the top of the limiting member.

[0013] Furthermore, a plurality of annular grooves are formed on an end surface of the sealing member away from the pressure relief hole. The plurality of annular grooves are concentrically arranged, and the diameters of the plurality of annular grooves gradually increase from the center of the sealing member toward the outside.

[0014] Compared with the prior art, the cover plate assembly provided by the utility model has the following advantages:

[0015] The cover plate assembly provided by the utility model comprises a cover plate, a sealing member and a limiting member; a pressure relief hole is formed on the cover plate, the limiting member is arranged corresponding to the pressure relief hole, is connected to the cover plate, and forms a limiting space with the cover plate; the sealing member is arranged in the limiting space and blocks the pressure relief hole, and the sealing member can be deformed under pressure to open the pressure relief hole.

[0016] From this analysis, it can be known that, through the pressure relief hole formed on the cover plate, when the internal pressure of the battery is too large and does not exceed the pressure relief value of the pressure relief valve, the internal pressure can be released through the pressure relief hole to ensure the safety of the battery. Accordingly, by providing a limiter that can be connected to the cover plate at the position corresponding to the pressure relief hole on the cover plate, a limit space can be formed in cooperation with the cover plate, and by further providing a blocking member in the limit space, the pressure relief hole can be blocked. In addition, since the blocking member in the present application can be deformed under pressure, when the pressure in the battery reaches a certain level, the gas leaks out from the pressure relief hole, thereby compressing the blocking member blocked in the pressure relief hole. As the blocking member is continuously compressed, the gas in the battery can be gradually discharged, thereby achieving a pressure relief action and ensuring the stability and safety of the battery during use.

[0017] In addition, the utility model also provides a battery, including a shell, a battery cell and the above-mentioned cover plate assembly, the battery cell is arranged in the shell, and the cover plate assembly is arranged to cover the open opening of the shell.

[0018] In a battery constructed using the cover assembly provided in the present application, when the pressure inside the battery reaches a certain value, the gas inside the battery will compress the sealing member, thereby achieving pressure discharge, thereby being able to ensure the stability and safety of battery use to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the overall structure of the cover plate assembly provided in an embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a blocking member in a cover plate assembly provided by an embodiment of the utility model from a first perspective;

[0022] Figure 3 A cross-sectional view of the connection between the blocking member and the cover plate in the cover plate assembly provided in an embodiment of the utility model;

[0023] Figure 4 A structural schematic diagram of a first implementation manner of a blocking member in a cover plate assembly provided in an embodiment of the utility model from a second viewing angle;

[0024] Figure 5 A structural schematic diagram of a second embodiment of a blocking member in a cover plate assembly provided by an embodiment of the utility model from a second viewing angle;

[0025] Figure 6 A schematic structural diagram of a position limiting member in a cover plate assembly provided in an embodiment of the utility model.

[0026] In the figure: 1-cover plate; 101-pressure relief hole; 102-first positioning groove; 103-second positioning groove; 104-explosion-proof valve; 2-limiting member; 201-connecting part; 202-covering part; 203-hollow hole; 3-blocking member; 301-protrusion; 302-recess; 303-annular groove. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0032] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0033] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0034] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0036] like Figure 1-Figure 3 As shown, the utility model provides a cover plate 1 assembly, including a cover plate 1, a blocking member 3 and a limiting member 2; a pressure relief hole 101 is formed on the cover plate 1, the limiting member 2 is arranged corresponding to the pressure relief hole 101, and is connected to the cover plate 1, and forms a limiting space with the cover plate 1; the blocking member 3 is arranged in the limiting space, and blocks the pressure relief hole 101, and the blocking member 3 can be deformed under pressure to open the pressure relief hole 101.

[0037] Through the pressure relief hole 101 formed on the cover plate 1, when the internal pressure of the battery is too large and does not exceed the pressure relief value of the pressure relief valve, the internal pressure can be released through the pressure relief hole 101 to ensure the safety of the battery. Accordingly, by providing a limiter 2 that can be connected to the cover plate 1 at a position corresponding to the pressure relief hole 101 on the cover plate 1, a limit space can be formed in cooperation with the cover plate 1, and by further providing a blocking member 3 in the limit space, the pressure relief hole 101 can be blocked. In addition, since the blocking member 3 in the present application can be deformed under pressure, when the pressure in the battery reaches a certain level, the gas leaks out from the pressure relief hole 101, thereby compressing the blocking member 3 blocked in the pressure relief hole 101. As the blocking member 3 is continuously compressed, the gas in the battery can be gradually discharged, thereby achieving a pressure relief action and ensuring the stability and safety of the battery during use.

[0038] It should be noted that the minimum opening pressure of the explosion-proof valve 104 of the battery is usually 0.4Mpa, so the pressure relief hole 101 provided in the present application is used to discharge pressure lower than 0.4Mpa. Accordingly, the maximum pressure at which the plugging member 3 in the present application is deformed by pressure is 0.4Mpa, so that the deformation of the plugging member 3 can be ensured, thereby ensuring the stable release of pressure.

[0039] Alternatively, if Figure 1-Figure 3As shown, the limiting member 2 in the present application includes a connecting portion 201 and a covering portion 202. The connecting portion 201 is circumferentially arranged around the covering portion 202, and together with the covering portion 202, forms a limiting member 2 having a cross-section in the vertical direction that is in the shape of a cross.

[0040] The connection area between the limiting member 2 and the cover plate 1 can be increased by the connecting portion 201, thereby ensuring the connection stability between the limiting member 2 and the cover plate 1, and the covering portion 202 can cooperate with the connecting portion 201 and the cover plate 1 to form a covering space, thereby achieving the limitation of the blocking member 3.

[0041] When the pressure relief is completed, the sealing member 3 is no longer subjected to pressure, and under the limiting effect of the cover portion 202, the sealing member 3 can only rebound and recover again, thereby being able to seal the pressure relief hole 101 again, ensuring the sealing performance inside the battery and avoiding the problem of electrolyte leakage.

[0042] Alternatively, if Figure 3 As shown, a first positioning groove 102 is formed on the cover plate 1 in the present application at a position corresponding to the pressure relief hole 101 , the diameter of the first positioning groove 102 is matched with the outer diameter of the limiting member 2 , and the connecting portion 201 of the limiting member 2 is embedded in the first positioning groove 102 .

[0043] By forming the first positioning groove 102 on the cover plate 1 and embedding the connecting portion 201 in the first positioning groove 102, the position limiting member 2 can be positioned, making the initial positioning between the position limiting member 2 and the cover plate 1 more stable. After positioning, the position limiting member 2 and the cover plate 1 can be connected by bonding or laser welding.

[0044] Alternatively, if Figure 6 As shown, the cover portion 202 in the present application is formed with a hollow hole 203, and the hollow hole 203 penetrates along the thickness direction of the cover portion 202, so that the limiting space is connected with the outside.

[0045] The hollow hole 203 formed by the cover portion 202 can realize the connection between the limited space and the outside world. When the gas in the battery is depressurized, it can be discharged to the outside world through the hollow hole 203, thereby avoiding the problem that the fully enclosed limiting member 2 cooperates with the cover plate 1 to form a completely enclosed limited space, causing the gas discharged from the battery to be accumulated in the limited space.

[0046] It should be additionally explained here that the hollow hole 203 in the present application can be completely formed on the connecting portion 201 or completely formed on the covering portion 202 . Of course, a part of the hollow hole 203 can also be formed on the connecting portion 201 and the other part on the covering portion 202 .

[0047] Alternatively, if Figure 6As shown, there are multiple hollow holes 203 in the present application, and the multiple hollow holes 203 are evenly distributed along the circumference of the limiting member 2.

[0048] By evenly distributing the hollow holes 203 along the circumference of the limiting member 2 , the limiting member 2 is subjected to uniform force, thereby preventing the blocking member 3 from deviating when compressed, thereby preventing the pressure relief hole 101 from being unable to return to its original position and block it.

[0049] In some embodiments, the end of the sealing member 3 in the present application away from the pressure relief hole 101 can be connected to the inner wall surface of the cover portion 202, that is, the limiting member 2 and the sealing member 3 are connected, thereby being able to avoid to a certain extent the problem of displacement of one end of the sealing member 3 that blocks the pressure relief hole 101 after being pressurized.

[0050] Preferably, the material of the blocking member 3 in the present application is elastic and resistant to electrolyte corrosion.

[0051] Alternatively, if Figure 2 Combination Figure 3 As shown, the cover plate 1 in the present application is formed with a second positioning groove 103 at the position corresponding to the pressure relief hole 101, and the diameter of the second positioning groove 103 is smaller than the diameter of the first positioning groove 102. A protrusion 301 is formed on the sealing member 3, and the diameter of the protrusion 301 is adapted to the diameter of the second positioning groove 103, and is embedded in the second positioning groove 103.

[0052] The blocking member 3 can be positioned by the formed second positioning groove 103 , so that the blocking member 3 can accurately block the pressure relief hole 101 .

[0053] It can be understood that the diameter of the second positioning groove 103 in the present application is slightly larger than the diameter of the blocking member 3 , so that the blocking member 3 can be easily deformed after being compressed.

[0054] Alternatively, if Figure 4 As shown, an embodiment of the blocking member 3 that is easy to deform is provided, wherein a recess 302 is formed on the end surface of the blocking member 3 at one end away from the pressure relief hole 101, the recess 302 is located at the center of the blocking member 3, and the edge of the end of the blocking member 3 is abutted against the inner wall of the top of the limiting member 2.

[0055] When the blocking member 3 is under pressure, the end of the blocking member 3 forming the recess 302 will make the edge weaker and easier to deform, thereby enabling the blocking member 3 to be lifted upward, thereby opening the pressure relief port and completing the pressure relief action.

[0056] Alternatively, if Figure 5As shown, another embodiment of the sealing member 3 that is easy to deform is provided, wherein a plurality of annular grooves 303 are formed on the end surface of the sealing member 3 away from the pressure relief hole 101, the plurality of annular grooves 303 are concentrically arranged, and the diameters of the plurality of annular grooves 303 gradually increase from the center of the sealing member 3 toward the outside.

[0057] By forming the annular groove 303, the end of the sealing member 3 away from the pressure relief hole 101 can also have a weak edge that is easy to deform, so that when under pressure, there can be sufficient deformation space to achieve deformation of the sealing member 3, thereby achieving the opening of the pressure relief hole and completing the pressure relief action.

[0058] In addition, the utility model also provides a battery, including a shell, a battery cell and the above-mentioned cover plate 1 assembly, the battery cell is arranged in the shell, and the cover plate 1 assembly is arranged to cover the open opening of the shell.

[0059] In a battery composed of the cover plate 1 assembly provided in the present application, when the pressure inside the battery reaches a certain value, the gas inside the battery will compress the sealing member 3, thereby achieving pressure discharge, thereby being able to ensure the stability and safety of battery use to a certain extent.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: It comprises a cover plate (1), a blocking member (3) and a limiting member (2); A pressure relief hole (101) is formed on the cover plate (1), and the limiting member (2) is arranged corresponding to the pressure relief hole (101), is connected to the cover plate (1), and forms a limiting space with the cover plate (1); The blocking member (3) is arranged in the limiting space and blocks the pressure relief hole (101); the blocking member (3) can be deformed under pressure to open the pressure relief hole (101).

2. The cover plate assembly according to claim 1, characterized in that: The limiting member (2) comprises a connecting portion (201) and a covering portion (202); the connecting portion (201) is arranged around the circumference of the covering portion (202) and together with the covering portion (202) form the limiting member (2) having a cross-section in the vertical direction in the shape of a cross.

3. The cover plate assembly according to claim 2, characterized in that: A first positioning groove (102) is formed on the cover plate (1) at a position corresponding to the pressure relief hole (101); the diameter of the first positioning groove (102) is matched with the outer diameter of the limiting member (2); and the connecting portion (201) of the limiting member (2) is embedded in the first positioning groove (102).

4. The cover plate assembly according to claim 2, characterized in that: The cover portion (202) is formed with a hollow hole (203), and the hollow hole (203) penetrates along the thickness direction of the cover portion (202), so that the limiting space is connected with the outside.

5. The cover plate assembly according to claim 4, characterized in that: There are a plurality of hollow holes (203), and the plurality of hollow holes (203) are evenly distributed along the circumference of the limiting member (2).

6. The cover plate assembly according to claim 1, characterized in that: The material of the blocking member (3) is elastic and resistant to corrosion by electrolyte.

7. The cover plate assembly according to claim 3, characterized in that: The cover plate (1) is formed with a second positioning groove (103) at a position corresponding to the pressure relief hole (101); the diameter of the second positioning groove (103) is smaller than the diameter of the first positioning groove (102); the blocking member (3) is formed with a protrusion (301); the diameter of the protrusion (301) is matched with the diameter of the second positioning groove (103), and the protrusion (301) is embedded in the second positioning groove (103).

8. The cover plate assembly according to claim 1, characterized in that: A recess (302) is formed on the end surface of the sealing member (3) away from the pressure relief hole (101); the recess (302) is located at the center of the sealing member (3), and the edge of the end of the sealing member (3) is in contact with the inner wall of the top of the limiting member (2).

9. The cover plate assembly according to claim 1, characterized in that: A plurality of annular grooves (303) are formed on an end surface of the sealing member (3) away from the pressure relief hole (101); the plurality of annular grooves (303) are concentrically arranged, and the diameters of the plurality of annular grooves (303) gradually increase from the center of the sealing member (3) toward the outside.

10. A battery, characterized in that: The invention comprises a shell, a battery cell and a cover plate assembly as claimed in any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the cover plate assembly is used for sealing the shell.

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